An analogy is not a valid argument. Analogies are useful for illustrating a concept, but a waste of time when trying to support a claim. Also, your analogy does not seem analogous to me.
Sir this is a Wendy's. We actually can not serve you lobster. Our kitchen doesn't support cooking lobster so sorry you will have to go find somewhere else.
Someone complains about bad food at restaurant. Defender responds "you fail to understand how cooking works".